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typescript-sdk/.changeset/spec-anchor-repin-2fb207da.md
Felix Weinberger 1823aae891
 Implement MCP 2026-07-28 (#2286) 
Co-authored-by: Matt <77928207+mattzcarey@users.noreply.github.com>
Co-authored-by: Konstantin Konstantinov <KKonstantinov@users.noreply.github.com>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
2026-06-26 14:01:10 +01:00

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@modelcontextprotocol/core-internal @modelcontextprotocol/client @modelcontextprotocol/server
patch patch patch

Re-pin the 2026-07-28 draft references (spec reference types, vendored schema.json twins, example corpus) to the latest spec commit and align the 2026-era wire surface with it. Deliberate 2026-era wire behavior changes (the released 2025-11-25 surface is untouched):

  • notifications/elicitation/complete is no longer part of the 2026-07-28 wire registry (the draft removed the notification together with elicitationId on URL-mode elicitation). On connections negotiated at 2026-07-28, sending it — including via Server.createElicitationCompletionNotifier() — now fails locally with SdkErrorCode.MethodNotSupportedByProtocolVersion, and inbound copies are dropped as unknown notifications. Both remain fully supported on 2025-11-25.
  • notifications/cancelled on 2026-era connections now parses with a revision-exact schema that requires requestId (the draft made it required); the notification _meta shape types the io.modelcontextprotocol/subscriptionId key. 2025-era parsing is unchanged.
  • The error code -32001 emitted for HTTP header/body mismatches is now defined by the draft schema (HEADER_MISMATCH); the emitted behavior is unchanged (documentation only).

No public API surface changes; the regenerated reference artifacts are internal/test-only.